Whereas a phrase query simply excludes documents that don’t contain the exact
query phrase, a proximity query—a phrase query where slop is greater
than 0—incorporates the proximity of the query terms into the final
relevance _score. By setting a high slop value like 50 or 100, you can
exclude documents in which the words are really too far apart, but give a higher
score to documents in which the words are closer together.

The following proximity query for quick dog matches both documents that
contain the words quick and dog, but gives a higher score to the
document in which the words are nearer to each other: